Request object inside experience fragment

Hi Team,

We have one experience fragment  in experience fragment we have   one component.

component is working fine but when we tried to inject the request object and to get the browser URL inside @postconstruct method we are not able to get the request inside the post construct method.

any one faces this issue any time 

if any solution inside Experience Fragment  to get the request object.

@Model(adaptables = {SlingHttpServletRequest.class, Resource.class}, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class LinkItem {

@Self
private  SlingHttpServletRequest request;

@PostConstruct
private void activate(){

String url=request.getRequestURI();